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AU633058B2 - Device for preparing bone cement - Google Patents

Device for preparing bone cement Download PDF

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Publication number
AU633058B2
AU633058B2 AU51551/90A AU5155190A AU633058B2 AU 633058 B2 AU633058 B2 AU 633058B2 AU 51551/90 A AU51551/90 A AU 51551/90A AU 5155190 A AU5155190 A AU 5155190A AU 633058 B2 AU633058 B2 AU 633058B2
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AU
Australia
Prior art keywords
agitator
channel
rod
lid
bone cement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
AU51551/90A
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AU5155190A (en
Inventor
Soren Jonsson
Thomas Nilsson
Staffan Smeds
Jan Thorling
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Cemvac System AB
Original Assignee
Cemvac System AB
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Filing date
Publication date
Application filed by Cemvac System AB filed Critical Cemvac System AB
Publication of AU5155190A publication Critical patent/AU5155190A/en
Assigned to CEMVAC SYSTEM AB reassignment CEMVAC SYSTEM AB Amend patent request/document other than specification (104) Assignors: SURGITEC AB
Application granted granted Critical
Publication of AU633058B2 publication Critical patent/AU633058B2/en
Anticipated expiration legal-status Critical
Expired legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/8802—Equipment for handling bone cement or other fluid fillers
    • A61B17/8805—Equipment for handling bone cement or other fluid fillers for introducing fluid filler into bone or extracting it
    • A61B17/8825—Equipment for handling bone cement or other fluid fillers for introducing fluid filler into bone or extracting it characterised by syringe details
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F31/00—Mixers with shaking, oscillating, or vibrating mechanisms
    • B01F31/44—Mixers with shaking, oscillating, or vibrating mechanisms with stirrers performing an oscillatory, vibratory or shaking movement
    • B01F31/441—Mixers with shaking, oscillating, or vibrating mechanisms with stirrers performing an oscillatory, vibratory or shaking movement performing a rectilinear reciprocating movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/50—Movable or transportable mixing devices or plants
    • B01F33/501—Movable mixing devices, i.e. readily shifted or displaced from one place to another, e.g. portable during use
    • B01F33/5011—Movable mixing devices, i.e. readily shifted or displaced from one place to another, e.g. portable during use portable during use, e.g. hand-held
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/50—Mixing receptacles
    • B01F35/514—Mixing receptacles the mixing receptacle or conduit being transparent or comprising transparent parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/713—Feed mechanisms comprising breaking packages or parts thereof, e.g. piercing or opening sealing elements between compartments or cartridges
    • B01F35/7137—Piercing, perforating or melting membranes or closures which seal the compartments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/7173—Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/7173—Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper
    • B01F35/71731—Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper using a hopper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/75—Discharge mechanisms
    • B01F35/754—Discharge mechanisms characterised by the means for discharging the components from the mixer
    • B01F35/75425—Discharge mechanisms characterised by the means for discharging the components from the mixer using pistons or plungers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/8802—Equipment for handling bone cement or other fluid fillers
    • A61B17/8833—Osteosynthesis tools specially adapted for handling bone cement or fluid fillers; Means for supplying bone cement or fluid fillers to introducing tools, e.g. cartridge handling means
    • A61B2017/8838—Osteosynthesis tools specially adapted for handling bone cement or fluid fillers; Means for supplying bone cement or fluid fillers to introducing tools, e.g. cartridge handling means for mixing bone cement or fluid fillers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30561—Special structural features of bone or joint prostheses not otherwise provided for breakable or frangible
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools for implanting artificial joints
    • A61F2002/4685—Special tools for implanting artificial joints by means of vacuum
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
    • A61F2250/0071—Additional features; Implant or prostheses properties not otherwise provided for breakable or frangible
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/20—Mixing of ingredients for bone cement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/565—Mixing liquids with solids by introducing liquids in solid material, e.g. to obtain slurries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/70—Mixers specially adapted for working at sub- or super-atmospheric pressure, e.g. combined with de-foaming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/75—Discharge mechanisms

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Veterinary Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Dispersion Chemistry (AREA)
  • Prostheses (AREA)
  • Materials For Medical Uses (AREA)
  • Surgical Instruments (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

PCT No. PCT/SE90/00018 Sec. 371 Date Oct. 30, 1991 Sec. 102(e) Date Oct. 30, 1991 PCT Filed Jan. 11, 1990 PCT Pub. No. WO90/13264 PCT Pub. Date Nov. 15, 1990.The present invention relates to an arrangement for the manufacture of bone cement by mixing together its constituent components comprising a mixing cylinder (1) in the form of a tube with a bottom (2) and a lid (3) and inside the mixing cylinder an axially movable agitator (4). The agitator consists of a piston-like agitator disc (4a), which is perforated by channels (4a1), through which the components of the bone cement are caused to flow during the mixing procedure and an agitator rod (4b) resembling a piston rod operatively connected to the agitator disc (4a) and supported in the lid (3) in such a way that it is free to slide. The invention is characterized in that the agitator rod (4b) has an axial channel (4b1), which is closed off at the agitator disc (4a) in such a way that it is capable of being opened. The bottom (2) is so arranged, under the effect of an axial force, as to be displaced like a piston axially in the direction of the lid (3), in conjunction with which the bone cement flows out through the channel (4b1) after it has been opened.

Description

OPI DATE 29/11/90 AOJP DATE 10/01/91
INTERNATIC
(51) International Patent Classification 5 A61B 17/56, A61L 25/00 A61F 2/46 APPLN. ID 51551 PCT NUMBER PCT/SE90/00018 EATY (PCT) (11) International Publication Number: WO 90/13264 Al (43) International Publication Date: 15 November 1990 (15.11.90) (21) International Application Number (22) International Filing Date: Priority data: 8901599-4 3 May PCT/SE90/00018 11 January 1990 (11.01.90) 1989 (03.05.89) Ci r .V Ac. S/STr;m fB (71) Applicant (for all designated States except US): SURGITEC AB [SE/SE]; Breviksvagen 3, S-311 45 Falkenberg (SE).
(72) Inventors; and Inventors/Applicants (for US only) SMEDS, Staffan [SE/ SE]; L6vgatan 12, S-582 45 Linkiping JONSSON, SOren [SE/SE]; Ronnhagsvigen 38, S-582 70 Link6ping THORLING, Jan [SE/SE]; Lilla HAlla 4242, S-791 91 Falun NILSSON, Thomas [SE/SE]; Breviksvagen 3, S-311 45 Falkenberg (SE).
(74) Agent: WILLQUIST, Bo; Pats. Willquist Patenter AB, S:t Larsgatan 29, S-582 24 Link6ping (SE).
(81) Designated States: AT (European patent), AU, BE (European patent), CA, CH (European patent), DE (European patent), DK, DK (European patent), ES (European patent), FI, FR (European patent), GB (European patent), IT (European pe ent), JP, KR, LU (European patent), NL (European patent), NO, SE (European patent), SU, US.
Published With international search report.
In English translation (filed in Swedish).
633 58 (54)Title: DEVICE FOR PREPARING BONE CEMENT (57) Abstract The present invention relates to an arrangement for the manufacture of bone cement by mixing together its constituent components comprising a mixing cylinder in the form of a tube with a bottom and a lid and inside the mixing cylinder an axially movable agitator The agitator consists of a piston-like agitator disc which is perforated by channels (4al), through which the components of the bone cement are caused to flow during the mixing procedure and an agitator rod (4b) resembling a piston rod operatively connected to the agitator disc (4a) and supported in the lid in such a way that it is free to slide. The invention is characterized in that the agitator rod (4b) has an axial channel (4bl), which is closed off at the agitator disc (4a) in such a way that it is capable of being opened. The bottom (2) is so arranged, under the effect of an axial force, as to be displaced like a piston axially in the direction of the lid in conjunction with which the bone cement flows out through the channel (4bl) after it has been opened.
See back of page WO~ 90/13264 PCT/SE90/00018 Device for preparing bone cement.
The present invention relates to an arrangement for the manufacture of bone cement by mixing together its constituent components comprising a mixing cylinder in the form of a tube with a bottom and a lid and inside the mixing cylinder an axially movable agitator in the form of a piston-like agitator disc, which is perforated by channels, through which the components of the bone cement are caused to flow during the mixing procedure and an agitator rod resembling a piston rod operatively connected to the agitator disc and supported in the lid in such a way that it is free to slide.
Bone cement is used in hip-joint operations, for example.
When manufacturing bone cement, for which purpose a component in the form of a powder and a liquid component require to be mixed, it is important that the nixture should be as homogeneous as possible, and that cases which occur during the mixing procedure are removed to the greatest extent possible. Any lack of homogenpity and gas inclusions have the effect of reducing the strength of the bone cement, which can result in a shorter service life for the implanted prosthesis. Furthermore, the gases which occur during manufacture are unhealthy, for which reason steps must be taken to ensure that they do not escape into the operating theatre.
The object of the present invention is to make available a preparation arrangement for bone cement, which is intended to be disposable and capable of being manufactured efficiently and at a low cost, and which also contributes to meeting the requirements stipulated above.in respect of the prepared bone cement.
This object is met in that the agitator rod has an axial SUBSTITUTE
SHEET
WO 90/13264 PP/SE0~/00018 2 channel, which is closed off at the agitator disc in such a way that it is capable of being opened, in that the bottom is executed with a device projecting towards the agitator disc arranged in such a way, when mixing is complete, as to penetrate the membrarne at that time, and in that the bottom is so arranged, under the effect of an axial force, as to be displaced like a piston axially in the direction of the lid, in conjunction with which the bone cement flows out through the channel in the agitator ror.
Additional advantages of the invention can be appreciated from the accompanying dependent claims and from the following description with reference to the accompanying drawing, in which Figs. la and lb illustrate schematically in longitudinal section a mixing cylinder with a bottom and an agitator supported in a lid in such a way that it is free to slide, in accordance with a first embodiment of the preparation arrangement in accordance with the invention. Fig. lc illustrates an agitator disc in accordance with the invention viewed from below. Fig. 2 is a longitudinal section through an arrangement in accordance with the aforementioned first embodiment, and Fig. 3 illustrates in detail the penetration of a sealing membrane. Fig. 4 illustrates how the aforementioned first embodiment of the preparation arrangemnent in accordance with the present invention is used as a bone cement syringe. Fig. 5 is a longitudinal section through a second embodiment of the preparation arrangement in accordance with the invention.
The designation 1 is used in the drawing for a mixing cylinder, and 2 for a bottom which is inserted in a sealing fashion into one end of the mixing cylinder 1.
The mixing cylinder 1 is preferably made from a transparent material, and the bottom 2, which, for WO 90/13264 PPSE90/00018 3 reasons which will become clear later, is made from a rubber-like elastic material, is executed with a projecting stud 2a facing towards the inside of the cylinder and has an annular flange-like projection 2b which engages in a corresponding groove la in the inner wall of the mixing cylinder 1.
The preparation arrangement in accordance with the invention also includes a lid 3 with an agitator 4 capable of axial movement therein. This comprises a piston-like agitator disc 4a and an agitator rod 4b supported in the lid 3 in such a way that it is free to slide. The lid is sealed against the inner wall of the mixing cylinder 1 and against the agitator rod 4b by means of 'O'-rings 5 and 6. The lid 3 also exihibits an evacuation channel 3a, which, via a line 7, is capable of connection to a vacuum sourcel (not shown here),' and which, when the lid 3 is fitted, discharges into the internal space of the mixing cylinder.
The agitator disc 4a is perforated by channels 4al, through which the bone cement components are caused to flow during agitation in order to make this as effective as possible..The agitator rod 4b exhibits in accordance with the invention an axial channel 4bl, which is closed off at the end of the rod 4b which is attached to the agitator disc 4a. The closure consists of a penetrable membrane 4c. This has fractural impressions 4cl, which are illustrated in Fig. Ic.
A dot screen and the designation 8, are used in Fig. la to indicate a powder, and the designation 9 and a pattern of dashes to indicate a liquid, which are the components of the bone cement and have been introduced into the mixing cylinder 1 via the opening which is intended to be closed off by means of the lid 3. In the interests of W 090/13264 PC/SE90/00018 4 clarity, these components are omitted from the other Figures.
The mixing procedure itself is illustrated in Fig. 2.
With the help of the agitator rod 4b, the agitator disc 4a is caused to move up and down inside the mixing cylinder i. This movement is indicated by means of a.
bidirectional arrow 10 in Fig. 2. Bidirectional arrows 11 are also used in the same Figure to illustrate how the components 8, 9 are caused in this way to flow through the channels 4a and through a space between the agitator disc 4a and the internal wall of the cylinder 1. Since the cylinder wall is transparent, a person skilled in the art can easily decide when the preparation of the bone cement is complete.
Once it has been established that the preparation is complete, the agitator 4 is moved downwards with a deliberate movement, which in Fig. 3 is illustrated by a downward-facing arrow 12, so that the agitator disc 4a cames into contact with the bottom 2. This results in penetration of the membrane 4c by the stud 2a, causing the membrane to rupture along the fractural impressions 4c1, which is illustrated by arrows 13 in Fig. 3. The agitator is then pulled to the position illustrated in Fig. 4. The channel 4bl inside the agitator rod 4b now communicates with the space inside the mixing cylinder 1 in which the prepared bone cement is present.
The preparation arrangement in accordance with the invention is now placed inside a syringe mechanism of the kind which is customarily used for the extrusion of sealing compound or similar in the form of a bead. This mechanism is indicated in Fig. 4 on the one hand as a holder part 14 marked as broken lines, in which the mixing cylinder 1 with its bottom 2, lid 3 and agitator WO 90/13264 PCT/SE90/00018 4 are placed, and on the other hand as a compression piston 15 with an associated compression rod 16.
When the compression piston 15 is caused to press against the bottom 2, which is illustrated by an upward-facing arrow 17, and when the compressive force has reached a sufficiently high level, the annular flange-like projection 2b will, as compression takes place, be forced out of the groove la and will function as a seal against the inner wall of the mixing cylinder 1. The bottom 2 now acts as a piston and forces the bone cement through the penetrated membrane 4c and via the channel 4bl to the outside for its intended use, as shown by an arrow 18.
The same reference designations are used in Fig. 5 in respect of details with the same function as, or with an analogous function to the corresponding details in the, earlier Figures. This Figure illustrates the alternative embodiment of the preparation arrangement in the state in which it is supplied for use. The mixing cylinder 1 and lid 3 are manufactured in a single piece. in this case, and the lid part 3, like the embodiment described aboi'e, has an evacuation channel 3a and a seal 5 against the agitator rod 4b. The bottom 2 in this case is formed as an outwardly open cup with annular flange-like seals 2b in contact with the inner wall of the mixing cylinder 1.
Unlike the embodiment of an arrangement in accordance with the invention for the manufacture of bone cement described above, the embodiment in accordance with Fig.
5 has a funnel 19 removably attached to the outer end of the agitator rod 4b and a rod 20 introduced into the axial channel 4bl of the agitator rod 4b, together with a tubular holder 21 into which the mixing cylinder 1 is introduced. The narrow opening of the funnel 19 is in close contact with the agitator rod 4b, and its purpose is to facilitate the introduction of the bone cement WO 90/13264 PC/SE90/00018 6 components into the mixing cylinder 1, for which purpose the rod 20 must have been pulled from the channel 4bl.
The rod 20 is of a length such that, when introduced fully into the channel 4bl, it reaches into the vicinity of the agitator disc 4a and is in this area executed with a seal 20a in contact with the inner wall of the channel 4b. The rod 20 with the seal 20a corresponds in its function to the membrane 4cl described above. At its opposite end the rod 20 is executed with a draw ring or similar. The mixing cylinder 1 and the piston 2 are fixed relative to the holder 21 by measis of a removable cotter pin 22.
The preparation arrangement in accordance with Fig. 5 is used as follows: The rod 20 is first removed so that the bone cement components can be introduced into the mixing cylinder 1 via the channel 4bl. The funnel 19 is then removed, and the rod 20 is introduced into the channel 4bl. The bone cement components are now mixed together, as previously described in conjunction with Figure 2, when any gases which occur are removed via the channel 3a. During the mixing procedure the arrangement is placed in the holder 21. Once the mixing procedure is complete, the cotter pin 22 is withdrawn from its position, thereby enabling the preparation arrangement to be removed freely from its holder 21 and placed in the syringe mechanism in the manner explained in conjunction with Figure 4. Once the cotter pin 22 has been removed, the piston 2 can be displaced axially under the effect of the compression piston 15. Once the rod 20 has been removed from the channel 4bl, bone cement can be forced out through it for the intended use.

Claims (5)

1. Arrangement for the manufacture of bone cement by mixing together its constituent components comprising a mixing cylinder in the form of a tube with a bottom and a lid and inside the mixing cylinder an axially movable agitator in the form of a piston-like agitator disc which is perforated by channels (4al), through which the components of the bone cement are caused to flow during the mixing procedure and an agitator rod (4b) resembling a piston rod operatively connected to the agitator disc (4a) and supported in the lid in such a way that it is free to slide, characterized in that the agitator rod (4b) exhibits an axial channel (4bl), which is closed off,at the agitator disc and in that the bottom is so arranged, under the effect of an axial force, as to be displaced like a piston axially in the direction of the lid in conjunction with which the bone cement flows out through the channel (4bl) after it has been opened.
2. Arrangement in accordance with Patent Claim, 1, characterized in that the closure of the channel (4bl) is achieved with a rod capable of being introduced into the channel, which rod is executed at one end with a seal, which, when in its introduced position in the area around the agitator disc is in contact with the inner wall of the channel (4bl).
3. Arrangement in accordance with Patent Claim 1, characterized in that the channel (4bl) is closed off by means of a penetrable membrane in that the bottom is executed with a device (2b) WOo 90/13264 PCt/SE9O/00018 8 projecting towards the agitator disc so arranged, when mixing is complete, as to penetrate the membrane (4c) when the agitator is displaced axially against the bottom
4. Arrangement in accordance with Patent Claim 1, characterized in that the lid exhibits an evacuation channel (3a) capable of connection to a vacuum source and so executed that, when the lid (3) is fitted, it discharges into the internal space of the mixing cylinder Arrangement in accordance with Patent Claim 1, characterized in that the mixing cylinder is transparent.
6. Arrangement in accordance with Patent Claim 2, characterized in that the agitator rod (4b) exhibits at its outer end a funnel intended to facilitate the filling of the components via the channel (4bl).
AU51551/90A 1989-05-03 1990-01-11 Device for preparing bone cement Expired AU633058B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8901599 1989-05-03
SE8901599A SE462315B (en) 1989-05-03 1989-05-03 DEVICE FOR MANUFACTURING BENCEMENT

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AU5155190A AU5155190A (en) 1990-11-29
AU633058B2 true AU633058B2 (en) 1993-01-21

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AU51551/90A Expired AU633058B2 (en) 1989-05-03 1990-01-11 Device for preparing bone cement

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US (1) US5252301A (en)
EP (1) EP0470959B1 (en)
JP (1) JP2915567B2 (en)
KR (1) KR0131143B1 (en)
AT (1) ATE126993T1 (en)
AU (1) AU633058B2 (en)
CA (1) CA2054196C (en)
DE (1) DE69022047T2 (en)
DK (1) DK0470959T3 (en)
ES (1) ES2078336T3 (en)
NO (1) NO314923B1 (en)
SE (1) SE462315B (en)
WO (1) WO1990013264A1 (en)

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Also Published As

Publication number Publication date
DE69022047D1 (en) 1995-10-05
NO914245L (en) 1991-10-30
US5252301A (en) 1993-10-12
SE462315B (en) 1990-06-11
JP2915567B2 (en) 1999-07-05
CA2054196C (en) 1999-01-19
DE69022047T2 (en) 1996-04-11
NO314923B1 (en) 2003-06-16
EP0470959B1 (en) 1995-08-30
KR0131143B1 (en) 1998-04-14
SE8901599D0 (en) 1989-05-03
KR920700587A (en) 1992-08-10
JPH04507200A (en) 1992-12-17
CA2054196A1 (en) 1990-11-04
NO914245D0 (en) 1991-10-30
ATE126993T1 (en) 1995-09-15
DK0470959T3 (en) 1995-12-18
WO1990013264A1 (en) 1990-11-15
EP0470959A1 (en) 1992-02-19
AU5155190A (en) 1990-11-29
ES2078336T3 (en) 1995-12-16

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